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Water heaters

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Hi, while not quiet a aquarium question, but related to their water heaaters.
Question; I need to heat a 200lt drum of water in winter to about 20C (68F).
Potential problem is when I drain the warmed water out the heater will be exposed to the air for a short while and then hit with cold water around 10C or below (50F).
I have been told this will cause the heater to blow up.
Any suggestions.

That would help with the heater being exposed to the air, not too sure about the temp difference once it's re-filled

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With heaters if they gonna be exposed to the air or a sudden temp change, the advice I was always given was to unplug the heater and let it cool down first. I usually unplug the heaters around half hour before I do any water change.

For heating water in a drum, a submersible heater would be good. Adding a small powerhead for water movement would be good too. Would help to mix the hot and cold water and avoid any hot/cold zones.

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Thanks for that info.
Basically what I am trying to do on the cheep is heat water for my orchids in winter.
My rainwater tank outside get down to 6 to 10C in winter and it is far to cold for my orchids when I water.
They are all in a greenhouse set at a minimum of 17C.
Looked at hot-water tanks but cheapest I can find in Australia is AU$650 + fittings.
I basically need to have the water around 20C and need about 150 to 300 Lt per watering day.
A lot of money for such a simple thing needing to do.

This may be expecting a tank heater to do just a bit too much. They are used to maintain heat, not heat from ice cold up. I would check into pond submersible heaters and see if you can find one that's reasonable.